1、Instrumentation,Control,and Protective Systems for Gas Fired HeatersAPI RECOMMENDED PRACTICE 556 SECOND EDITION,APRIL 2011REAFFIRMED,APRIL 2019Instrumentation,Control,and Protective Systems for Gas Fired HeatersDownstream SegmentAPI RECOMMENDED PRACTICE 556 SECOND EDITION,APRIL 2011Special NotesAPI
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14、y by API,1220 L Street,NW,Washington,DC 20005.Suggested revisions are invited and should be submitted to the Standards Department,API,1220 L Street,NW,Washington,DC 20005,standardsapi.org.iiiContentsPage1Scope.11.1Purpose.11.2General.12References.22.1Normative References.22.2Other References.23Fired
15、 Heaters.33.1General.33.2Process Measurement.33.3Process Control.193.4Protective Systems.21Figures1Forced Draft Fired HeaterFuel Side.222Natural Draft Fired HeaterFuel Side.233Natural Draft Fired HeaterProcess Side.24Tables1Alarm Summary Table.552Safe State Table.563Cause and Effects Table.614Startu
16、p Sequence,Natural Draft Heaters.625Startup Sequence,Forced Draft and Balanced Draft Heaters.64Annex A(normative)Tube Rupture Considerations.66v1Instrumentation,Control,and Protective Systems for Gas Fired Heaters1 Scope1.1 Purpose1.1.1 This recommended practice(RP)provides guidelines that specifically apply to instrument,control and protective system installations for gas fired heaters in petroleum production,refineries,petrochemical and chemical plants.1.1.2 A gas fired general service heater
